How to remove self intersecting parts of model after Bridge Edge loops?
Rather than trying to do it yourself, Blender (2.8+) comes with an addon built in for producing extra mesh objects including pipe joints.
Search 'extra' in the Addons section under Preferences and check 'Add Mesh: Extra objects'

You'll then see an extra section on the 'Add menu' with a Pipe Joints section:

Add an Pipe Elbow and change the settings to what you need:
Then add a Solidify modifer, adjust its thicknes and apply it to give you the final object: